AAT1271 Datasheet, PDF (5/19 Pages) Advanced Analogic Technologies – 1.5A Step-Up Current Regulator for Flash LEDs

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PRODUCT DATASHEET
AAT1271
1.5A Step-Up Current Regulator for Flash LEDs
Typical Characteristics
Efficiency vs. Input Voltage
(Movie and Flash Mode)
90
85
750mA/ch
80
102mA/ch
52mA/ch
75
26mA/ch
70
65
60
55
50
45
40
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Boost Switching Frequency vs. Input Voltage
(Movie Mode; L = 1µH)
3
2.5
2
1.5
1
85°C
0.5
25°C
-40°C
0
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Shutdown Current vs. Input Voltage
(V_EN/SET = V_FLEN = 0V)
0.03
0.025
0.02
0.015
0.01
0.005
0
25°C
-40°C
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
1000
900
800
700
600
500
400
300
200
100
0
2.7
Supply Current vs. Input Voltage
(V_EN = V_FLEN = 3.6V)
85°C
25°C
-40°C
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
Movie Mode Current Matching vs. Temperature
(IFLOUTX = 103mA/Ch; VIN = 3.6V; L = 1µH)
120
115
110
105
100
95
90
85
FLOUTA
FLOUTB
80
-40
-15
10
35
60
85
Temperature (°C)
Movie Mode LED Current Accuracy vs. Input Voltage
(IFLOUTX = 103mA/Channel; L = 1µH)
10
8
6
4
2
0
-2
-4
-6
FLOUTA
-8
FLOUTB
-10
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Input Voltage (V)
1271.2008.08.1.1
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